Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c7682a3916144…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 05:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3ae4775bca6e03bb9b9a56a279b99a2 SHA-1: 19dc92f952c605023bb09176399d0e2320f76586 SHA-256: f81c7682a39161442635d8a8ed6c5fa5d70410a0175c080d593088fe3368d6c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it acts as a link farm or redirects users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d6378f31a---92469560917.pdf In PDF document text
    • https://valleyrentals.com/userfiles/file/67264387568.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/66861128955.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/816539291.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/tinovepaduvamavunifabeso.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/65163096753.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091118082341.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/sukapevevuzulale.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/2425140829.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/xapopelagasutu.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vipatodopemuj.pdfIn PDF document text
    • http://snft.ro/media/file/70771004205.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/60142896651.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zeloko.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/rukoruxuluxarajir.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/ziwotafomibofan.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/fukupi.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/9372149594.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/49109055756.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/19238559320.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56983242458.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/gafoluvogigevuvul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=play+pokemon+omega+ruby+on+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 18792 bytes
SHA-256: 337819935856f4e8f1021e615c31c4d18b3a230f5b0b260d2b476d390d2f179d
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10804 bytes
SHA-256: cd2a6d3d94a92cf7f3e2190b48d211171957055863c9d1e7eb4666fd9db2ba58

Open this report in the interactive analyzer, or submit your own file for analysis.